Salisbury Screen Terahertz Absorber Formed with an Insulator: 4-N,N-Dimethylamino-4′-N′-methyl-stilbazolium Tosylate (DAST)

Abstract

A novel Salisbury screen absorber (SSA) based on a 4- N , N -dimethylamino-4′- N ′-methyl-stilbazolium tosylate (DAST) crystalline film was designed and fabricated. Different from the conventional SSA, an insulating organic DAST film replaced the normally highly conductive top surface metal layer. The absorption spectra and the structure of this SSA were optimized with a transmission line model to correspond to the DAST absorption peak at 1.1 THz, whose results were further verified by numerical simulations. If the thickness of the DAST film is 4 μm, a nearly perfect terahertz (THz) absorption is possible with this strategy, whereas the absorption of a bare 4 μm thick DAST film would be 4 times lower. The design allows the terahertz response of this DAST system to be tuned by adjusting either the thickness of the DAST film or the spacer, both of which remain in deep sub-wavelength to broaden the range of applications.

Study on third-order two-photon fluorescence property of DAST

“…[1][2][3] Based on an intrinsic linear absorption of 23.2% and a high optical conductivity of 6.47×10 -5 S at the frequency of 1.1 THz, Gu and co-workers designed a high-performance DAST-based Salisbury screen absorber which achieves a great enhancement in terahertz absorption in 0−4 THz. [4] Remarkably, the linear absorption of this DAST-based Salisbury screen absorber is up to 92.9% at the frequency of 1.1 THz. [4] Moreover, it was reported that DAST microplates grown by a substrate-supported fast evaporative crystallization technique exhibit outstanding linear emission properties with bright orange fluorescence.…”

Recent Advances in the Development of Materials for Terahertz Metamaterial Sensing

“…designed an absorber containing a 4‐ N , N ‐dimethylamino‐4′‐ N ′‐methyl‐stilbazolium tosylate (DAST) crystalline film (Figure 14b). [ 143 ] Nearly perfect terahertz absorption was observed for a 4 µm thin DAST film, which allowed tuning the terahertz signal response by adjusting its thickness. Zhang et al.…”

“…Reproduced with permission. [ 143 ] Copyright 2019, American Chemical Society. c) Schematic illustration of the dielectric multilayer consisting of nine alternating dielectric PC (7 µm) and PVDF (5 µm) layers.…”

Graphene-Assisted Narrow Bandwidth Dual-Band Tunable Terahertz Metamaterial Absorber

“…Huang et al designed a metamaterial absorber based on temperature variation that contains a periodic array of metal circle resonators with strontium titanate [30]. Gu et al designed and fabricated a new kind of Salisbury screen absorber formed by DAST crystalline films [31]. The terahertz response of the absorber can be adjusted by changing the thickness of the DAST film and the spacer.…”